/Engine/Plugins/Editor/AssetManagerEditor/Source/AssetManagerEditor/Public/ReferenceViewer/EdGraph_ReferenceViewer.h
The Provision Size, or vertical spacing required for layout, for a given parent. At the time of writing, the intent is only the first node manifestation of an asset will have its children shown
int32 ProvisionSize ( const [FAssetIdentifier](API\Runtime\CoreUObject\AssetRegistry\FAssetIdentifier) & InParentId ) const